Bolt-anchor.



( J. CLEMENTS.

BOLT ANCHOR. APPLI'IATION FILED JAN. 28. 1910.

983,479. Patented Feb. 7, 1911.-

2 SHEETS-SHEBT l.

INVENTOR I I 1 w/m C. J. (ELEMENTS.

BOLT ANCHOR.

APRLIOATION FILED JAN. 28. 1910.

983,479. Patented Feb.7,1911.'

2 SHEETS-SHEET 2.

To "(all whom it may conctm;

"UNITED" STATES 'rnrnnnonnron.

cHAnLns J. crnnnnrs, or BROOKLYN, NEWJYoRK. i

'- BOLT-ANCHOR.

Specification of Letters latent.

Patented Feb. a, 191i.

Application filed January 28,1910. Serial No. 540,486.

Be it known that I, CHARLES J. CLnMENTs,

a citizen of the United States of America,

and a resident of Brooklyn, county of Kings,

and State of New York, have invented 'cer-' upon the insertion of the bolt to be anchored.

The particular type of bolt anchor to which my invention relates is hat comprislngcanexpansible shield composed of a plurality of longitudinally divided laterally separable sections, the interi r of which is screw-threaded, and theext' nor of which is provided with projections.

It is the main object of my present invention to improve and simplify the construc- .tion of this type of bolt anchor, increase the strength thereof and reduce the cost of manufacture of the same, and to this end I provide the-anchor with tapered walls of uniform thickness throughout the length thereof, the interior. being preferably screwthreaded, and the exterior provided with projections which progressively increase in he'ight toward the smaller end of the anchor the said projections being preferably Sadie posed. as not to register with the screw threads, a convenient and satisfactory form thereof being annular.

anchor. will be found to 'be' light in weight owing to the reduction. of the quantity of metal from that ordinarily employed, yet of increasedfstrength owing to the more uniform distribution of the metal.

. My invention also consists in providing the laterally separable sect-ions with overhanging alining lugs of such length that they Wlll embrace the section they engage sufficiently to prevent relative lateral sepa-' ration of the sections, until they-are forced apart in use. i f

In order that my invention may be fully understood, I will now proceed to describe an embodimenttliereof, having reference to the accompanying drawings,illustrating the same, and will then point out the novel fea- In the drawingsz'Figure l-isa View In the form shown in the This form of bolt a view in outside elevation of an anchor in V .which the exteriorpro ections are in 1nd1- vldual pyramidal form-instead of being in annular form as are those shown in;-Fig. 1.

Fig. 7 is a View in central longitudinal sect1on of an anchor 1n which the interior screw threads are interrupted.

The anchor is of tubular form being preferably constructed of a. pluralit of sections.

rawings the anchor is composed of two similar semi-annular sections 1011 in mutual engagement upon amedial lane. t

The interior ore of the anchor is longitudinally tapered, and' the walls 16thereof which, constitute the body portion of the anchor are'of uniform thickness throughout,

that is to say,the outer and inner surfaces of the anchor are parallel. with respect to each other but are oblique to the longitudinal axis of the" anchor. Interiorscrew threads 12 are conveniently provided in the bore of the anchor, the same projecting inwardly as is shown, and such threads may be provided the pitclr of the anchor threads.

. The anchor is provided upon its exterior with a plurality of portions which project beyond-the walls 16' of the anchonfor progressively increasing distances. These projecting portions are preferably out of fegister with the interiorly projecting screw threads, and they may conveniently be in theform of annular projections 13 as is shownin the first five figures 'of the drawings, or in the form of individual pyramidal projections 14:, in which form they are shown in Fig. 6. .The height of the projections increases prcgressivelyfrom the large to the small end of the anchor walls,

the extremities thereof 1 ina" referabl Y in a p 5 p 3 either throughout the entire length of the cylindrical surface, coaxial with the anchor bolt, so that the anchor as a whole will just fit a cylindrical holewhen in its contracted or non-extended condition. The projections may alsobe spaced progressively farther apart as they increase in height as will be readily understood by reference to the drawi In use the anchor is inserted in a hole in 'a stone or brick wall or other placeinrwhich the boltis to be anchored, and the bolt is then inserted in the large end-of the bore, and screwed into place. As the bolt is screwed home the inner end of the anchor will be expanded'and the exterior projections forced into the walls of the hole so as to fasten the same securely thereto. By reason of the fact that the increased thickness required at th'e'inner end 'of the anchor for the purpose of giving a divergent form to the portionwhich engages the walls of the hole when the anchor is expanded, is obtained by increasing the height of the exterior projections. while I maintaining the walls 16 of 'the same thickness throughout, it will be found possible to employ but a I minimum of material in constructing the anchor, whereby the weight of the anchor will be lessened and the cost of manufacture thereof reduced, while at the same time a maximum "of strength will be obtained. Moreover, if the projections are made out of register with screw threads, as is preferred,

the tendency to fracture between the threads, which is common where-helical exterior projections which register with 1 the screw threads are employed, is "obviated.

It has been common in the past to provide sectional bolt anchors with short alining lugs which" act to maintain the sections against "relative longitudinal displacement and against relative ateral'displacement in the plane upon which they are united, but in order to maintain them against relative lateral displacement in a direction at ri ht angles to suchplane some other means as been employed su'ch as one or more springs,

clips, or elastic bands.

In accordance with my present invention, 1 provide alining lugs 15 of such length and arranged to overhang to ch an extent that they. will not onl act to aline the parts but will also act as e ective means to clams assembled.

thereof. I have shown oneyset as carried by the'section 1-0, and embracing the section 11, and the other set as carried by the section 11 and embracing the section 10, but such arran ement. and disposition is unimportant and may, of course, be varied. In manufacture, the parts may be sprung together, where the. nature of thematerial employed permits it,or the lugs may be forced together after the sections have been What I claim is 1. A bolt anchor having a body )ortion in the form of a longitudinally ivided tube constituting substantially the frustuln of a hollow cone, the walls whereof are of uniform thickness throughout, the said body portion being provided on u the exterior thereof with projections whichprogressively increase in height toward the smaller' end thereof.

2. A bolt anchor having a body portion in the form of a longitudinally divided tube constituting substantially the frustum of a hollow cone, the walls whereof are ofuni: form thickness throughout, the said lg'ody portion being, provided 9n the exterior thereofwith projections which progressively increase in height toward the smaller end thereof, the extremities of the said projections being tangent to a cylinder. a

. 3. A bolt anchor having abodyportion in the form of a longitudinally divided tube constituting substantially the frustum .of'a hollow cone, the walls whereof are of uniform'thickness throu bout, the saidbody portion being provi ed on the exterior thereof with annular projections which pro.- 'gressively increase in height toward the smaller end thereof.

4. A bolt anchor having a body ortion in the form of a longitudinally divided tube constituting substantially the frustum of a hollow cone, the walls whereof are of uniformthickness throu hout, the said-body portion being provided on the exterior thereof with annular projections which pro gressively increase in height toward the smaller end thereof, the extremities of the said projections being tangent to a cylinder.

5. A bolt anchor having a body portion in the form of a longitudinally divided tub'c constituting substantially the frustum. of 1 hollow cone, the walls whereof are of uniform thickness throu bout, the said bddy portion being provi ed on the exterior" thereof withpro'ections which progressively increasein heig it toward the smaller'end thereof, .and u on the interior thereof with helical pro ections constituting screw threads.

6. A bolt "anchor having a body portion in the form ofJa longitudinally divided tube constituting; substantially the frustum of a "hollow cone, the walls whereof are of uni- 983,479 7 t v Edi increase in height towardthe smaller end thereof and are spaced at, progressively-increasing distances apart.

a. A bolt anchor having a body portion in the form of a longitudinally dividedtubeconstituting substantially the frustum of a hollow cone. the walls whereof are of uniform thickness throughout, the said body portion being provided on the exterior thereof w th 1)1()j(0i1()115 WlllClI progressively 111-.

crease in height toward the snialler end thereof and which are generally out of-regis tor with the screw threads.

the for-in of a longitudinallydivide tube constituting substantially the frost-uni of a 1101- low cone, the walls whereof areof uniform thickness throughout, the said body portion being provided on the exterior thereof with PI'OJGUUUHS which progressively increase ;in

I height toward "the smaller endrthereofand;

which are generally-out of register with the screw, threads, the extremities of the'.'saidprojections being tangent to. a cylinder.

10. A bolt anchor having a body portion in the fol-in of a longitudinally divided tube constitutiiig substantially the frust-um of a hollow cone. the walls whereof areof -uniform thickness throughout, the said body portion being. provided ion the jext"erior thereof with annular projections which pro gressively increase in height toward. the.

.Slilttllel end thereof, and upon the interior thereof with helical projections constitutingso' I screw threads.

11. Afbolt anchor having a body portion if in the form of a longitudinally divided tube,

fsi onal plane.- 9'. A; bolt anchor having a body ortion in constituting substantially the frustuin of a hollow cone, the walls whereof are of uniform thickness throughout, the said body portion being provided on the exterior there'- ofwith annular projections which progressively increase in height toward the smaller end thereof, the extremities of the-said projections being tangent to a cylinder, and upon the interior thereof with helical projections constituting screw threads.

12. ,Afibolt anchor having a body portion in the'forni of a. longitudinallydivided tube constituting substantially the frustuni of a hollow cone, the walls whereof are of uni form thickness throughout, the said body porti-on bei-ng provided upqn the exterior thereof with annular-pi'inectionswhich progressivelyi-ncrease in height toward one end of the anclior'and are speced at progres sivelydi creasing distances apart, and upon the interior thereof with helical projections constituting screw threads. T

13. A bolt anchor composed of a pluralityof sections provided with overhanging aliiiing an d clamping lugs'for securing the sections together against lateral displacement in a direction transverse of their divi-- '14. A bolt lanchor' coiiiposed of two seniiannular sections provided with overhanging aliniiig-and clamping lugs carried by one.

section and. arranged to partially embrace the other section, thejsaid lugs being of sufiicient length to claw the sections normally. 1 together. a ainst re ative lateral displace ;r'nent iii-a irection transverse of theirdivisional planer l5. Abolt anchor composed oftwo seiniaiinular sectioii's, one of which is provided with laterally-pro eeting alining and clamping lugs'forengagenieiit with the other sec:

adapted to engage a convergent-portion of the said other section whereb 'toprevent relative lateral d splacement o the two sections in a direction transverseof their dii i l-Pem- CHARLES JJ OLEMENTS Witnesses: I B. Moor-i i,

E. A.-CLE ENTS.

vtion,-t he said lugs being convergent and 

